killed in libya came home. ♪ seven marines carrying each casket from an air force c-17 transport bringing them to a hanger filled not just with leaders, not just commanders and dignitaries, but comrades, colleagues, family, and friends. the killing of ambassador christopher stevens, sean smith and former navy seals glen doherty and tyrone woods has become part of a political battle back home. there was not even a hint of that here, of course. among those in attendance, colin powell, secretary of state during the last administration, current secretary of state and defense. secretary of state hillary clinton saying that the four lives lost were lived in service to their country and are, in her words, at the heart of what makes america great and good. president obama vowed to bring the killers to justice. >> the united states of america will never retreat to the world, we will never stop working for the dignity and freedom that every person deserves, whatever their creed, whatever their faith. that's the essence of american leadership. that's the spirit that sets us apart from other nations.